* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

:root {
    --blue: #2563eb;
    --blue-dark: #1e3a8a;
    --sky: #dbeafe;
    --dark: #0f172a;
    --gray: #64748b;
    --green-bg: #dcfce7;
    --green-text: #166534;
    --red-bg: #fee2e2;
    --red-text: #991b1b;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #eff6ff, #ffffff 45%, #dbeafe);
    color: var(--dark);
}

.topbar {
    max-width: 1180px;
    margin: auto;
    padding: 28px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 58px;
    height: 58px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.brand h1 {
    font-size: 30px;
}

.brand p {
    color: var(--gray);
}

.teacher-link,
.secondary-btn {
    text-decoration: none;
    color: var(--blue-dark);
    background: white;
    border: 1px solid var(--sky);
    padding: 12px 18px;
    border-radius: 14px;
    font-weight: bold;
}

.main-container {
    max-width: 1180px;
    margin: auto;
    padding: 20px;
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 28px;
}

.hero-card,
.form-card,
.dashboard-card {
    background: white;
    border-radius: 28px;
    padding: 34px;
    box-shadow: 0 20px 50px rgba(15,23,42,0.08);
}

.hero-card h2 {
    font-size: 44px;
    margin: 18px 0;
}

.hero-card p {
    color: var(--gray);
    line-height: 1.6;
}

.badge {
    display: inline-block;
    background: var(--sky);
    color: var(--blue-dark);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: bold;
}

.form-card h2,
.dashboard-card h2 {
    margin-bottom: 20px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

input,
textarea,
select {
    width: 100%;
    padding: 14px;
    border-radius: 15px;
    border: 2px solid var(--sky);
    font-size: 15px;
}

textarea,
pre {
    font-family: Consolas, monospace;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--blue);
}

button {
    width: 100%;
    border: none;
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: white;
    padding: 16px;
    border-radius: 16px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
}

.message {
    display: none;
    margin-top: 20px;
    padding: 16px;
    border-radius: 16px;
    font-weight: bold;
    text-align: center;
}

.success {
    background: var(--green-bg);
    color: var(--green-text);
}

.error {
    background: var(--red-bg);
    color: var(--red-text);
}

.hidden {
    display: none !important;
}

.dashboard-card {
    grid-column: 1 / -1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 18px;
    margin-bottom: 25px;
}

.stat-card {
    background: #f8fafc;
    border: 1px solid var(--sky);
    border-radius: 20px;
    padding: 22px;
}

.stat-card span {
    font-size: 34px;
    font-weight: bold;
    color: var(--blue-dark);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: 20px;
    border: 1px solid var(--sky);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 14px;
    border-bottom: 1px solid #e2e8f0;
    text-align: left;
}

th {
    background: #eff6ff;
    color: var(--blue-dark);
}

.status-pill {
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: bold;
}

.status-wait {
    background: #fef3c7;
    color: #92400e;
}

.status-ok {
    background: var(--green-bg);
    color: var(--green-text);
}

.status-redo {
    background: var(--red-bg);
    color: var(--red-text);
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 26px;
    padding: 30px;
    width: 100%;
    max-width: 900px;
}

pre {
    background: #0f172a;
    color: white;
    padding: 18px;
    border-radius: 16px;
    overflow-x: auto;
}

@media(max-width: 900px) {

    .main-container {
        grid-template-columns: 1fr;
    }

    .hero-card h2 {
        font-size: 34px;
    }
}

@media(max-width: 650px) {

    .grid-2,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .form-card,
    .dashboard-card,
    .hero-card {
        padding: 24px;
    }
}
#submitBtn {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 14px;
    background: #1d4ed8;
    color: white;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

#submitBtn:hover {
    background: #1e40af;
}

#submitBtn.loading {
    opacity: 0.85;
    cursor: wait;
}

.btn-spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.4);
    border-top: 3px solid white;
    border-radius: 50%;
    display: none;
    animation: spin 0.8s linear infinite;
}

#submitBtn.loading .btn-spinner {
    display: inline-block;
}

@keyframes spin {

    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }

}
#classiContainer {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 25px;
}

.classe-card,
.compito-card,
.mese-box,
.empty-box {
    background: white;
    border: 1px solid #dbeafe;
    border-radius: 18px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(15,23,42,0.08);
}

.classe-card h3 {
    font-size: 26px;
    color: #1e3a8a;
}

.classe-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.danger-btn {
    background: #dc2626;
}

.back-btn {
    margin-bottom: 20px;
    background: #64748b;
}

.mese-box {
    margin-top: 25px;
}

.compito-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

.open-link {
    background: #2563eb;
    color: white;
    padding: 10px 14px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: bold;
}

.empty-box {
    text-align: center;
    color: #64748b;
    font-weight: bold;
}